Mets rookie relievers: Who could make the team in 2018?

The Mets have the seventh-worst bullpen in baseball and have consistently had blowups all season. While Jerry Blevins is safe and the back end combination of AJ Ramos and Jeurys Familia is too, there are several rookies who are auditioning for bigger roles next season. Here's a look at who could contribute in 2018 and who is in danger of heading back to the minor leagues.

MLB: Pittsburgh Pirates at New York Mets

RHP Paul Sewald

Noah K. Murray | USA TODAY Sports

2017 stats: 0-5, 4.58 ERA

For the most part, Sewald has been a decent bullpen piece this year. He's gained trust by eating innings and he's gotten the Mets out of some sticky situations. But Sewald hsan't been immune to growing pains and his ERA is quickly approaching the 5.00 range for a reason: He's struggled against left-handed hitters. Lefties have hit .298 off him and he has an ERA of 5.15 against them. He began the season in the minors with the intent on learning another pitch to throw against lefties but was quickly called up and the learning process was hastened.